EP0298469A2 - Verfahren zur Herstellung hochporöser Glaskeramikformteile - Google Patents
Verfahren zur Herstellung hochporöser Glaskeramikformteile Download PDFInfo
- Publication number
- EP0298469A2 EP0298469A2 EP88110847A EP88110847A EP0298469A2 EP 0298469 A2 EP0298469 A2 EP 0298469A2 EP 88110847 A EP88110847 A EP 88110847A EP 88110847 A EP88110847 A EP 88110847A EP 0298469 A2 EP0298469 A2 EP 0298469A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- silicon
- disilane
- formula
- radical
- room temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C1/00—Ingredients generally applicable to manufacture of glasses, glazes, or vitreous enamels
- C03C1/006—Ingredients generally applicable to manufacture of glasses, glazes, or vitreous enamels to produce glass through wet route
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C10/00—Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition
- C03C10/0009—Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition containing silica as main constituent
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C11/00—Multi-cellular glass ; Porous or hollow glass or glass particles
Definitions
- EP-A-107943 describes carbon-containing monolithic glasses which have been obtained from gels of organosilsesquioxanes of the general formula RSiO 3/2 . Defect-free molded parts can only be achieved due to the low porosity of these gels by complex drying procedures, even then the reproducibility of the dimensions of the molded parts is not guaranteed.
- the object was to provide a process for the production of highly porous, defect-free glass ceramic molded parts which contain carbon atoms bonded to silicon atoms, with reproducible dimensions and high porosity, while avoiding expensive drying and processing processes.
- This object is achieved by a process for the production of highly porous glass ceramic molded parts which contain carbon atoms bonded to silicon atoms, which is characterized in that a molded part consisting of an organopolysiloxane which is solid at room temperature from units of the formula where R is a radical of the formulas bonded via a silicon-silicon single bond can be implemented under a non-oxidizing atmosphere or in a vacuum at temperatures in the range from 700 to 1300 ° C.
- the preferred temperature range in the process according to the invention is within the limits of 900 to 1100 ° C.
- a reproducible volume shrinkage of 40 to 55% occurs, which is of decisive importance for the production of molded parts with reproducible dimensions.
- the weight loss is 15 to 20%.
- the reaction is carried out under a non-oxidizing atmosphere, that is to say under an inert atmosphere such as nitrogen or argon or under a reducing atmosphere such as carbon monoxide or hydrogen, or in vacuo.
- the heating program must be adapted to the respective problem and essentially depends on the residual solvent content and the size and shape of the molded part.
- the moldings used according to the invention consisting of an organopolysiloxane which is solid at room temperature and consist of units of the formula where R is a radical of the formulas bonded via a silicon-silicon single bond can be obtained preferably by a sol-gel process, wherein a disilane of the general formula wherein R 'each independently of the other is methyl, ethyl or isopropyl, optionally in a mixture with a disilane of the general formula wherein R 'has the meaning given above, in a shaping container with water optionally in the presence of alcohol and subsequently ammonia is added.
- the shaping containers can represent bodies of any kind, for example cylinders or cuboids. Preferred volumes of these bodies are in the range from 1 to 500 cm3. Preferred materials for the shaping containers are Teflon, polyethylene, glass or aluminum.
- Preferred parameters in the production of the molded parts, consisting of an organopolysiloxane solid at room temperature from units of the formula where R is a radical of the formulas bonded via a silicon-silicon single bond can be: Composition: 0-40 wt .-%, especially 15-30 wt .-% alcohol 20-50 wt .-%, in particular 25-40 wt .-% water and 40-60 wt .-%, in particular 43-52 wt .-% disilanes. Temperature: 10-50 ° C, especially 15-30 ° C.
- Disilanes of the general formulas wherein R 'is independently methyl, ethyl or isopropyl and where R 'has the meaning given above are known compounds and according to Hengge et al., Monthly Bulletin for Chemistry, 105, 671-683 (1984) or WH Atwell et al., Journal of Organometallic Chemistry, 7, 71-78 ( 1967) easily accessible.
- Preferred disilanes are 1,2-dimethyltetramethoxydisilane and 1,1,2-trimethyltrimethoxydisilane.
- alcohol used are methanol, ethanol and isopropanol.
- the moldings used according to the invention consisting of an organopolysiloxane which is solid at room temperature and consist of units of the formula where R is a radical of the formulas bonded via a silicon-silicon single bond can be obtained preferably by a sol-gel process, wherein a disilane of the general formula wherein R 'each independently of the other is methyl, ethyl or isopropyl, optionally in a mixture with a disilane of the general formula wherein R 'has the meaning given above, is reacted in a shaping container with water, if appropriate in the presence of alcohol, and ammonia is subsequently added until a pH in the range from 6.0 to 6.5 is reached.
- the pH is adjusted by adding ammonia. This can be done, for example, by adding aqueous ammonia, by introducing gaseous ammonia or by adding substances which release ammonia when heated, such as urotropin, urea or basic ammonium salts (e.g. (NH4) 2CO3).
- the molded part consisting of an organopolysiloxane which is solid at room temperature, can consist of units of the formula where R is a radical of the formulas bonded via a silicon-silicon single bond can be removed from the shaping container and dried in air at temperatures of preferably 20 to 150 ° C, in particular 25 to 100 ° C.
- reproducible shrinkage occurs, which is decisive for the production of molded parts with reproducible dimensions has interpretation.
- the highly porous glass ceramic molded parts produced by the process according to the invention and containing carbon atoms bonded to silicon atoms have a density of 0.7-0.8 g / cm 3 and a porosity of 60-70%. They are not electrically conductive and show good resistance to temperature changes up to 1000 ° C. Their temperature resistance in air is guaranteed up to a temperature of 1300 ° C.
- the glass ceramic molded parts produced by the process according to the invention are used for thermal insulation and for filtration, preferably at high temperatures or high pressures.
- a sol prepared from water, methanol and 1,2-dimethyltetramethoxydisilane was treated with concentrated ammonia solution until the initial pH value had risen from 4.8 to 6.0 (see Table 1).
- the sol was then poured into a cylindrical glass mold with an inner diameter of 30 mm and a height of 100 mm. After 10-15 minutes the sol had gelled into a highly porous gel. After a further 10 minutes the gel was removed from the mold and air dried for 24 hours.
- Table 1 shows density d (g / cm3) and shrinkage D (% compared to the diameter of the mold) of the dried moldings.
- a solution prepared from 72.5 g (8 mol) of water, 48.0 g (3 mol) of methanol and 105 g (0.5 mol) of 1,2-dimethyltetramethoxydisilane was mixed with concentrated ammonia solution until the pH of 4, which was initially set, 8 rose to 6.0.
- the sol was now poured into a tiled polyethylene mold with internal dimensions 100x100x30mm. After 10 minutes at 25 ° C, the sol gelled to a highly porous gel that filled the entire mold. After a further 10 minutes, the molded part was removed from the mold and air-dried at 25 ° C. for 24 hours. The resulting molded part had a density of 0.38 g / cm3, the edge length had shrunk by 11%.
- test specimens produced according to Examples 2, 3 and 4 were heated to 1000 ° C. in a chamber furnace with argon purge and left at this temperature for 60 minutes.
- Table 2 shows the mass losses in% and the densities in g / cm3.
- Table 2 example Mass loss density Test specimen from example 6 17.1 0.74 2nd 7 17.2 0.79 3rd 8th 17.3 0.70 4th
- a dry gel tile produced according to Example 5 was heated in a chamber furnace under argon purging to 1000 ° C. and left at this temperature for 60 minutes. After cooling, a black, porous tile was obtained which had lost 17.3% in weight and 45.9% in volume compared to the dry gel.
- the material had a density of 0.75 g / cm3 with a porosity of 66.8%.
- the porosity determination by Hg porosimetry showed a very narrow pore size distribution with a maximum at 4 micrometers.
- the surface area according to the BET method was 1.5 m2 / g.
- a highly porous, carbon-containing glass ceramic tile produced in accordance with Example 9 was heated in a chamber furnace to 1300 ° C. in an air atmosphere and left at this temperature for 10 hours. After cooling, there was no change in weight. Furthermore, this tile was heated to 1000 ° C in a chamber furnace and quickly immersed in a water bath at a temperature of 25 ° C. Even after repeating this process ten times, the tile was not damaged.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geochemistry & Mineralogy (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Crystallography & Structural Chemistry (AREA)
- Ceramic Engineering (AREA)
- Glass Compositions (AREA)
- Silicon Polymers (AREA)
- Glass Melting And Manufacturing (AREA)
- Ceramic Products (AREA)
- Silicon Compounds (AREA)
- Porous Artificial Stone Or Porous Ceramic Products (AREA)
Abstract
Description
- In der EP-A-107943 sind kohlenstoffhaltige monolithische Gläser beschrieben, die aus Gelen von Organosilsesquioxanen der allgemeinen Formel RSiO3/2 erhalten wurden. Defektfreie Formteile sind wegen der geringen Porosität dieser Gele nur durch aufwendige Trocknungsprozeduren erreichbar, wobei auch dann die Reproduzierbarkeit der Maße der Formteile nicht gegeben ist.
- Es bestand die Aufgabe ein Verfahren zur Herstellung hochporöser, defektfreier Glaskeramikformteile, die an Siliciumatome gebundene Kohlenstoffatome enthalten, mit reproduzierbaren Maßen und hoher Porosität bereitzustellen unter Vermeidung von aufwendigen Trocknungs- und Verarbeitungsprozessen.
- Gelöst wird diese Aufgabe durch ein Verfahren zur Herstellung hochporöser Glaskeramikformteile, die an Siliciumatome gebundene Kohlenstoffatome enthalten, das dadurch gekennzeichnet ist, daß ein Formteil, bestehend aus einem bei Raumtemperatur festen Organopolysiloxan aus Einheiten der Formel
- Der bevorzugte Temperaturbereich beim erfindungsgemäßen Verfahren liegt innerhalb der Grenzen von 900 bis 1100 °C. Beim erfindungsgemäßen Verfahren tritt in Abhängigkeit von der gewählten Zusammensetzung des Formteils, bestehend aus einem bei Raumtemperatur festen Organopolysiloxan, ein reproduzierbarer Volumenschrumpf von 40 bis 55 % auf, was für die Herstellung von Formteilen mit reproduzierbaren Maßen entscheidende Bedeutung hat. Der Gewichtsverlust beträgt 15 bis 20 %.
Die Umsetzung wird unter nichtoxidierender Atmosphäre, das heißt unter inerter Atmosphäre wie Stickstoff oder Argon oder unter reduzierender Atmosphäre wie Kohlenmonoxid oder Wasserstoff, oder im Vakuum durchgeführt. Das Aufheizprogramm muß der jeweiligen Problemstellung angepaßt werden und hängt im wesentlichen von Lösungsmittelrestgehalt, sowie Größe und Form des Formteils ab. - Die erfindungsgemäß verwendeten Formteile, bestehend aus einem bei Raumtemperatur festen Organopolysiloxan aus Einheiten der Formel
- Die formgebenden Behälter können Körper jeglicher Art wiedergeben, beispielsweise Zylinder oder Quader. Bevorzugte Volumen dieser Körper liegen im Bereich von 1 bis 500 cm³. Bevorzugte Materialien für die formgebenden Behälter sind Teflon, Polyethylen, Glas oder Aluminium.
- Bevorzugte Parameter bei der Herstellung der Formteile, bestehend aus einem bei Raumtemperatur festen Organopolysiloxan aus Einheiten der Formel
Zusammensetzung: 0-40 Gew.-%, insbesondere 15-30 Gew.-% Alkohol
20-50 Gew.-%, insbesondere 25-40 Gew.-% Wasser und
40-60 Gew.-%, insbesondere 43-52 Gew.-% Disilane. Temperatur:
10-50°C, insbesondere 15-30°C. - Sehr gute Ergebnisse wurden mit 22 Gew.-% Alkohol, 33 Gew.-% Wasser und 45 Gew.-% Disilan erhalten.
- Disilane der allgemeinen Formeln
- Bevorzugte Beispiele für eingesetzte Alkohle sind Methanol, Ethanol und Isopropanol.
- Die erfindungsgemäß verwendeten Formteile, bestehend aus einem bei Raumtemperatur festen Organopolysiloxan aus Einheiten der Formel
- Die Einstellung des pH-Wertes erfolgt durch Zugabe von Ammoniak. Dies kann beispielsweise durch Zugabe von wäßrigem Ammoniak, durch Einleiten von gasförmigem Ammoniak oder durch Zugabe von bei Erwärmung Ammoniak abspaltenden Substanzen wie Urotropin, Harnstoff oder basischen Ammonsalzen (z.B. (NH₄)₂CO₃) erfolgen.
- Nach dem Gelieren kann das Formteil, bestehend aus einem bei Raumtemperatur festen Organopolysiloxan aus Einheiten der Formel
- Die nach dem erfindungsgemäßen Verfahren hergestellten hochporösen Glaskeramikformteile, die an Siliciumatome gebundene Kohlenstoffatome enthalten, weisen eine Dichte von 0,7-0,8g/cm³ bei einer Porosität von 60-70% auf. Sie sind nicht elektrisch leitfähig und zeigen eine gute Temperaturwechselbeständigkeit bis 1000°C. Ihre Temperaturbeständigkeit an Luft ist bis zu einer Temperatur von 1300°C gewährleistet.
- Die nach dem erfindungsgemäßen Verfahren hergestellten Glaskeramikformteile finden Verwendung zur thermischen Isolierung und zur Filtration, vorzugsweise bei hohen Temperaturen oder hohen Drücken.
- Ein aus Wasser, Methanol und 1,2-Dimethyltetramethoxydisilan hergestelltes Sol wurde so lange mit konzentrierter Ammoniaklösung versetzt, bis der Anfangs-pH-Wert von 4,8 aus 6,0 gestiegen war (s.Tabelle 1). Das Sol wurde dann in eine zylindrische Glasform mit Innendurchmesser 30mm und 100mm Höhe gegossen. Nach 10-15min war das Sol zu einem hochporösen Gel geliert. Nach weiteren 10 Minuten wurde das Gel aus der Form entnommen und 24h luftgetrocknet. Tabelle 1 zeigt Dichte d (g/cm³) und Durchmesserschwund D (% gegenüber dem Durchmesser der Form) der getrockneten Formteile.
Tabelle 1 Beispiel Gew.-% H₂O Gew.-% MeOH Gew.-% Disilan pH d D 1 26 23 51 6,0 0,53 18,5 2 34 21 45 6,0 0,49 14,7 3 33 22 45 6,0 0,37 11,1 4 32 26 42 6,0 0,34 11,1 - Ein aus 72,5g (8mol) Wasser, 48,0g (3mol) Methanol und 105g (0,5mol) 1,2-Dimethyltetramethoxydisilan hergestelltes Sol wurde so lange mit konzentrierter Ammoniaklösung versetzt, bis der sich anfangs einstellende pH-Wert von 4,8 auf 6,0 gestiegen war. Das Sol wurde nun in eine kachelförmige Polyethylenform mit Innenmaßen 100x100x30mm gegossen. Nach 10min bei 25°C gelierte das Sol zu einem hochporösem Gel, das die gesamte Form ausfüllte. Nach weiteren 10min wurde das Formteil aus der Form genommen und 24h bei 25°C luftgetrocknet. Das resultierende Formteil wies eine Dichte von 0,38g/cm³ auf, die Kantenlänge war um 11% geschrumpft.
- Die gemäß Beispiel 2, 3 und 4 hergestellten Testkörper wurden in einem Kammerofen mit Argonspülung auf 1000°C aufgeheizt und 60min bei dieser Temperatur belassen. Tabelle 2 zeigt die Massenverluste in % und die Dichten in g/cm³.
Tabelle 2 Beispiel Massenverlust Dichte Testkörper aus Beispiel 6 17,1 0,74 2 7 17,2 0,79 3 8 17,3 0,70 4 - Eine gemäß Beispiel 5 hergestellte Trockengel-Kachel wurde in einem Kammerofen unter Argonspülung auf 1000°C aufgeheizt und 60min bei dieser Temperatur belassen. Nach dem Abkühlen erhielt man eine schwarze, poröse Kachel die gegenüber dem Trockengel um 17,3% an Gewicht und um 45,9% an Volumen verloren hatte. Das Material wies eine Dichte von 0,75g/cm³ bei einer Porosität von 66,8% auf. Die Porositäts-Bestimmung durch Hg-Porosimetrie ergab eine sehr enge Porengrößenverteilung mit einem Maximum bei 4 micrometer. Die Oberfläche nach BET-Methode betrug 1,5m²/g.
- Eine gemäß Beispiel 9 hergestellte hochporöse, kohlenstoffhaltige Glaskeramik-Kachel wurde in einem Kammerofen unter Luftatmosphäre auf 1300°C aufgeheizt und 10h bei dieser Temperatur belassen. Nach Abkühlung zeigte sich keine Gewichtsveränderung.
Des weiteren wurde diese Kachel in einem Kammerofen auf 1000°C aufgeheizt und rasch in ein Wasserbad mit einer Temperatur von 25°C getaucht. Auch nach zehnmaliger Wiederholung dieses Vorgangs trat keine Beschädigung der Kachel auf.
Claims (6)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT88110847T ATE80597T1 (de) | 1987-07-08 | 1988-07-07 | Verfahren zur herstellung hochporoeser glaskeramikformteile. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3722597 | 1987-07-08 | ||
DE19873722597 DE3722597A1 (de) | 1987-07-08 | 1987-07-08 | Verfahren zur herstellung hochporoeser glaskeramikformteile |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0298469A2 true EP0298469A2 (de) | 1989-01-11 |
EP0298469A3 EP0298469A3 (en) | 1989-09-13 |
EP0298469B1 EP0298469B1 (de) | 1992-09-16 |
Family
ID=6331162
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP88110847A Expired - Lifetime EP0298469B1 (de) | 1987-07-08 | 1988-07-07 | Verfahren zur Herstellung hochporöser Glaskeramikformteile |
Country Status (6)
Country | Link |
---|---|
US (1) | US5015605A (de) |
EP (1) | EP0298469B1 (de) |
JP (1) | JPS6424080A (de) |
AT (1) | ATE80597T1 (de) |
CA (1) | CA1316671C (de) |
DE (2) | DE3722597A1 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0403848A2 (de) * | 1989-06-01 | 1990-12-27 | Wacker-Chemie Gmbh | Verfahren zur Herstellung vom sphärischem, monodispersem Organopolysiloxan oder Siliciumoxycarbid |
FR2650269A1 (fr) * | 1989-07-28 | 1991-02-01 | Gen Electric | Structures en verre cellulaire derivant de resines silicones expansees et procedes pour leur preparation |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5512359A (en) * | 1990-01-12 | 1996-04-30 | Alliedsignal Inc. | High flexural strength ceramic fiber reinforced silicon carboxide composite |
US5459307A (en) * | 1993-11-30 | 1995-10-17 | Xerox Corporation | System for storage and retrieval of digitally encoded information on a medium |
US5618766A (en) * | 1996-07-22 | 1997-04-08 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Lightweight ceramic composition of carbon silicon oxygen and boron |
DE10030665A1 (de) * | 2000-06-23 | 2002-01-03 | Merck Patent Gmbh | Gelierform zur Herstellung von Formkörpern |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1081726A (fr) * | 1952-08-18 | 1954-12-22 | Rhone Poulenc Sa | Nouvelles résines organosiliciques et leurs préparations |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
USRE32107E (en) * | 1982-12-23 | 1986-04-08 | Dow Corning Corporation | Carbon-containing monolithic glasses and ceramics prepared by a sol-gel process |
US4686124A (en) * | 1983-12-12 | 1987-08-11 | Sumitomo Bakelite Company Ltd. | Thermoplastic resin-silicone rubber composite shaped article |
US4640901A (en) * | 1985-03-18 | 1987-02-03 | University Of Cincinnati | High temperature membrane |
US4705837A (en) * | 1986-04-08 | 1987-11-10 | Massachusetts Institute Of Technology | Method for converting Si-H containing polysiloxanes to new and useful preceramic polymers and ceramic materials |
US4818732A (en) * | 1987-03-19 | 1989-04-04 | The Standard Oil Company | High surface area ceramics prepared from organosilane gels |
US4789389A (en) * | 1987-05-20 | 1988-12-06 | Corning Glass Works | Method for producing ultra-high purity, optical quality, glass articles |
US4828588A (en) * | 1988-04-01 | 1989-05-09 | University Of Cincinnati | Process for preparation of heterogeneous polysiloxane membrane and membrane produced |
-
1987
- 1987-07-08 DE DE19873722597 patent/DE3722597A1/de not_active Withdrawn
-
1988
- 1988-06-13 US US07/206,146 patent/US5015605A/en not_active Expired - Fee Related
- 1988-06-14 CA CA000569457A patent/CA1316671C/en not_active Expired - Fee Related
- 1988-07-04 JP JP63165178A patent/JPS6424080A/ja active Pending
- 1988-07-07 EP EP88110847A patent/EP0298469B1/de not_active Expired - Lifetime
- 1988-07-07 AT AT88110847T patent/ATE80597T1/de active
- 1988-07-07 DE DE8888110847T patent/DE3874630D1/de not_active Expired - Lifetime
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1081726A (fr) * | 1952-08-18 | 1954-12-22 | Rhone Poulenc Sa | Nouvelles résines organosiliciques et leurs préparations |
Non-Patent Citations (2)
Title |
---|
CERAMIC ENGINEERING AND SCIENCE PROCEEDINGS, Band 4, Nrs. 9/10. September-Oktober 1983, Seiten 704-717, Columbus, Ohio, US; F.K. CHI: "Carbon-containing monolithic glasses via the sol-gel process" * |
JOURNAL OF NON-CRYSTALLINE SOLIDS, Band 82, Nrs. 1/3, Juni 1986, Seiten 24-30, Elsevier Science Publishers B.V., Amsterdam, NL; S. SAKKA et al.: "Hydrolysis and polycondensation of dimethyldiethoxysilane and methyltriethoxysilane as materials for the sol-gel process" * |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0403848A2 (de) * | 1989-06-01 | 1990-12-27 | Wacker-Chemie Gmbh | Verfahren zur Herstellung vom sphärischem, monodispersem Organopolysiloxan oder Siliciumoxycarbid |
EP0403848A3 (de) * | 1989-06-01 | 1991-01-02 | Wacker-Chemie Gmbh | Verfahren zur Herstellung vom sphärischem, monodispersem Organopolysiloxan oder Siliciumoxycarbid |
US5130400A (en) * | 1989-06-01 | 1992-07-14 | Wacker-Chemie Gmbh | Process for preparing spherical, monodispersed organopolysiloxanes or silicon oxycarbides |
FR2650269A1 (fr) * | 1989-07-28 | 1991-02-01 | Gen Electric | Structures en verre cellulaire derivant de resines silicones expansees et procedes pour leur preparation |
Also Published As
Publication number | Publication date |
---|---|
JPS6424080A (en) | 1989-01-26 |
DE3874630D1 (de) | 1992-10-22 |
EP0298469B1 (de) | 1992-09-16 |
US5015605A (en) | 1991-05-14 |
DE3722597A1 (de) | 1989-01-19 |
CA1316671C (en) | 1993-04-27 |
ATE80597T1 (de) | 1992-10-15 |
EP0298469A3 (en) | 1989-09-13 |
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